How old do you have to be to vape? How Old Do You Have to be to Vape? Minimum Legal Age? LOOKAH Only FDA authorized vape products are available for purchase in Kentucky. Here's what to know A new Kentucky law requiring smoke shops to obtain updated retail licenses takes effect Jan. 1, marking a significant step in efforts to prevent youth vaping across the state. Details below. Northern Kentucky Health Department launches vape disposal program to address youth vaping